<template>
  <div>
    <table border="1" width="700" style="border-collapse: collapse">
      <caption>
        购物车
      </caption>
      <thead>
        <tr>
          <th>
            <input type="checkbox" v-model="cop" /> <span>全选</span>
          </th>
          <th>名称</th>
          <th>价格</th>
          <th>数量</th>
          <th>总价</th>
          <th>操作</th>
        </tr>
      </thead>
      <tbody>
        <Gwctr v-for="(obj,index) in goodList" :key="index" :list="obj" :index="index" @change="fn"></Gwctr>
      </tbody>
      <tfoot>
        <tr>
          <td>合计:</td>
          <td colspan="5">
            {{sum}}
          </td>
        </tr>
      </tfoot>
    </table>
  </div>
</template>

<script>
import Gwctr from '@/components/GwcTr'
export default {
  data() {
    return {
      goodList: [
        {
          name: "诸葛亮",
          price: 1000,
          num: 1,
          checked: false,
        },
        {
          name: "蔡文姬",
          price: 1500,
          num: 1,
          checked: false,
        },
        {
          name: "妲己",
          price: 2000,
          num: 1,
          checked: false,
        },
        {
          name: "鲁班",
          price: 2200,
          num: 1,
          checked: false,
        },
      ],
    };
  },
  components: {
    Gwctr,
  },
  methods: {
    fn(ind) {
        this.goodList.splice(ind,1)
    }
  },
  computed: {
    cop: {
      set(val) {
        this.goodList.forEach(item => item.checked = val)
      },
      get() {
        return this.goodList.every(item => item.checked)
      }
    },
    sum() {
      return this.goodList.reduce((prve, item) => {
        if (item.checked) {
          return prve + item.price * item.num
        } else {
          return prve
        }

      }, 0)
    }
  }
};
</script>

<style>

</style>